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Viewing changes to retired/CVE-2016-7055

  • Committer: Steve Beattie
  • Date: 2019-02-19 06:18:27 UTC
  • Revision ID: sbeattie@ubuntu.com-20190219061827-oh57fzcfc1u9dlfk
The ubuntu-cve-tracker project has been converted to git.

Please use 'git clone https://git.launchpad.net/ubuntu-cve-tracker' to
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retired/CVE-2016-7055
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PublicDateAtUSN: 2016-11-11
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Candidate: CVE-2016-7055
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PublicDate: 2017-05-04
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References:
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 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7055
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 https://www.openssl.org/news/secadv/20161110.txt
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 https://www.openssl.org/news/secadv/20170126.txt
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 https://usn.ubuntu.com/usn/usn-3181-1
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Description:
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 There is a carry propagating bug in the Broadwell-specific Montgomery
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 multiplication procedure in OpenSSL 1.0.2 and 1.1.0 before 1.1.0c that
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 handles input lengths divisible by, but longer than 256 bits. Analysis
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 suggests that attacks against RSA, DSA and DH private keys are impossible.
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 This is because the subroutine in question is not used in operations with
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 the private key itself and an input of the attacker's direct choice.
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 Otherwise the bug can manifest itself as transient authentication and key
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 negotiation failures or reproducible erroneous outcome of public-key
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 operations with specially crafted input. Among EC algorithms only Brainpool
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 P-512 curves are affected and one presumably can attack ECDH key
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 negotiation. Impact was not analyzed in detail, because pre-requisites for
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 attack are considered unlikely. Namely multiple clients have to choose the
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 curve in question and the server has to share the private key among them,
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 neither of which is default behaviour. Even then only clients that chose
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 the curve will be affected.
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Ubuntu-Description:
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Notes:
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 mdeslaur> only affects 1.0.2 and 1.1.0
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Bugs:
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Priority: low
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Discovered-by:
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Assigned-to: mdeslaur
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Patches_openssl:
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 upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=2fac86d9abeaa643677d1ffd0a139239fdf9406a (master)
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 upstream: https://git.openssl.org/?p=openssl.git;a=commit;h=57c4b9f6a2f800b41ce2836986fe33640f6c3f8a (1.0.2)
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upstream_openssl: needs-triage
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precise_openssl: not-affected (1.0.1-4ubuntu5.38)
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trusty_openssl: not-affected (1.0.1f-1ubuntu2.21)
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vivid/ubuntu-core_openssl: not-affected (1.0.1f-1ubuntu11.6)
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vivid/stable-phone-overlay_openssl: not-affected (1.0.1f-1ubuntu11.6)
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xenial_openssl: released (1.0.2g-1ubuntu4.6)
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yakkety_openssl: released (1.0.2g-1ubuntu9.1)
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devel_openssl: released (1.0.2g-1ubuntu11)
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Patches_openssl098:
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upstream_openssl098: not-affected
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precise_openssl098: not-affected
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trusty_openssl098: not-affected
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vivid/ubuntu-core_openssl098: DNE
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vivid/stable-phone-overlay_openssl098: DNE
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xenial_openssl098: DNE
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yakkety_openssl098: DNE
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devel_openssl098: DNE
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